* New version (0.56)
Supporting GTID in MySQL 5.6
Modifying test case settings
* Adding --orig_master_ssh_user and --new_master_ssh_user
for online master switch
* Modifying test case my.cnf
Bug Fix: When connecting to the latest slave, $target->{ssh_port}
should not be used, but $latest_slave->{ssh_port} should be used
New Major Feature: Supporting GTID, MTS and remote binlog server